I've had a vodafone sure signal for a couple of years and it's always worked fine. However, I've had no mobile signal for 4 days now, and on phoning Vodafone this morning they said it was because I'd recenlty upgraded (which it's not as it was working for the first few days I had my new phone) and advised me to re-register. However on Vodafone's eforum, thousands of people are apparently having the same problem. It seems pretty shoddy to me that they didn't come clean about this on the phone. Has anyone else know anything about this??